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Figure 4-1
Dial Plate with knob removed
NOTE: Locate thermometer in same position for every
calibration.
4. If calibration of fryer is found to be less than 25°F
off, simply loosen the four retaining screws holding
the dial plate in place. Reset the dial plate to match
the thermometer reading. If the fryer is found to be
more than 25°F off, a qualified service company
must be contacted to have the fryer properly
calibrated.
C. Thermostat Bulb Positioning
BEFORE REPLACING, TEST THERMOSTATS:
Operational problems can easily be corrected by
thermostat bulb positioning.
Keating's patented thermostat application is accurate
within 2°F of the dial setting between 250°F – 350°F.
This accuracy is attained only if the thermostat bulb is
placed properly against the heat transfer tube. To
quickly and accurately test for proper bulb placement,
a single thickness of writing paper should be pulled
through between the tube and the bulb with medium
resistance.*
1. *For gas fryers 14":
n The end of thermostat bulb should touch the burner
tube.
2. For gas fryers 18" & up:
n If the bulb is too loose, the paper will slip through
with little or no resistance. A fryer with a thermostat
bulb that is too loose will overshoot.
Overshoot: The thermostat takes a long time to
cycle and then misses its preset temperature by
20°F - 40°F yielding a poor quality product.
n If the bulb is too tight, the paper will either not pull
through or it will tear. A fryer with a thermostat bulb
that is too tight will short cycle.
Short Cycle: The thermostat will cycle rapidly while
the fryer is in the idle mode; the temperature will be
erratic.
Thermostat Bulb Positioning 18
REQUIRED TEST EQUIPMENT:
Multimeter (for testing continuity)
CHECKING CONTINUITY WITH THE MULTIMETER
1. Rotate the thermostat shaft until an audible click
is heard.
2. Rotate the thermostat shaft left and right ten times
causing the switch to click on and off ten times,
while using the Multimeter to verify continuity.
3. If the switch does not show continuity during all
ten trials, replace the thermostat.
CAUTION
Disassembling the thermostat will void the
thermostat warranty.
1. Set compression ring onto capillary end of bulb
finger tight, 1/2" from end of capillary.
2. Insert new thermostat bulb through control panel
back.
3. Apply oil resistant flexible sealant onto
compression fitting thread before installing fitting
into fryer vessel.
4. Position bent portion of bulb against far right heat
transfer tube and install compression fitting snugly
into fryer vessel.
5. Adjust bulb so at least 2" of bent portion of it is
next to heat transfer tube and tighten
compression nut onto compression fitting for fryer
18 & up. The end of thermostat bulb should touch
the burner tube for 14" fryers.
6. Refill fryer with oil to "fill level line".
7. Start fryer, preheat and calibrate with
thermometer.
Figure 4-3
Thermostat Bulb Positioning
9
"
& up Fryer Gas
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